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Permanent immunity-Vaccine against flu

Which virus can causes flu? Why does not body create permanent immunity against that virus? How does vaccine against the flu work?

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Flu is a disease caused through the influenza virus, an extremely mutant DNA virus. Because of the high mutation rate of virus, which forms many dissimilar strains, flu always presents epidemic functions in influenced populations and people might have numerous flu episodes throughout life (the immune response made from  preceding infections is not capable in prospect infections).

The vaccine against flu is the vaccine made of attenuated virus of three dissimilar strains. Each year WHO (or World Health Organization) researches and finds out which the strains that must compose the vaccine are. This is a strategy to face the elevated mutation rate of virus.

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